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Spark plug for internal combustion engine

a technology for spark plugs and internal combustion engines, which is applied in the manufacture of spark plugs, sparking plugs, electrical equipment, etc., can solve the problems of increasing manufacturing man-hours, complicated ground electrode shapes, and easy blockage of airflow of air-fuel mixture, so as to prevent the concentration of electric fields on the corner curved face, suppress the degradation of ignitability of air-fuel mixture, and reduce the effect of manufacturing man-hours

Active Publication Date: 2019-10-01
DENSO CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The present disclosure provides a spark plug for an internal combustion engine that has a simple structure and can ensure stable ignitability regardless of how it is mounted. The problem of complicated ground electrode shapes and increased manufacturing costs is solved by this invention.

Problems solved by technology

If the ground electrode is formed thick to prevent the reduction in strength, the airflow of the air-fuel mixture is eventually easily blocked.
The configuration in which the ground electrode is joined to the housing by a plurality of thin plate members, also described in Patent Literature 1, has problems of making the shape of the ground electrode complicated, increasing the manufacturing man-hours, and increasing the manufacturing cost.

Method used

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  • Spark plug for internal combustion engine
  • Spark plug for internal combustion engine
  • Spark plug for internal combustion engine

Examples

Experimental program
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first embodiment

[0038]Referring to FIGS. 1 to 10, an embodiment of a spark plug for an internal combustion engine will be described.

[0039]A spark plug 1 for an internal combustion engine of the present embodiment includes, as shown in FIGS. 1 and 4, a cylindrical housing 2, a cylindrical insulator 3, a center electrode 4, and a ground electrode 5. The insulator 3 is held inside the housing 2. The center electrode 4 is held inside the insulator 3 so that a tip end part 41 protrudes. As shown in FIG. 1, the ground electrode 5 is connected to the housing 2 and forms a spark discharge gap G between the ground electrode 5 and the center electrode 4. The ground electrode 5 includes an upright part 51 and an inclined part 52. The upright part 51 is vertically provided on a tip end part 21 of the housing 2 to a tip end side. The inclined part 52 is bent from a tip of the upright part 51 toward the center electrode 4 side, and is extended toward an oblique tip end side.

[0040]As shown in FIGS. 1 to 3, the in...

second embodiment

[0079]As shown in FIGS. 11 and 12, the present embodiment changes the shape of the end portion of the extension side E1 in the extension direction E of the inclined part 52, contrary to the first embodiment.

[0080]As shown in FIG. 12, the shape of the end portion of the inclined part 52 on the extension side E1 in the extension direction E has a thinner shape in the width direction Y toward the extension side E1.

[0081]That is, when viewed in the orthogonal direction O, the end portion of the inclined part 52 on the extension side E1 has a smaller dimension in the width direction Y toward the extension side E1 in the extension direction E.

[0082]In the present embodiment, the ground end face 521 has a parallel face 521a with the normal direction as the extension direction E, and a pair of taper faces 521b with the normal direction inclined to the width direction Y with respect to the extension direction E. The pair of taper faces 521b is formed on both sides of the parallel face 521a i...

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PUM

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Abstract

A spark plug for an internal combustion engine includes a cylindrical housing, a cylindrical insulator, a center electrode, and a ground electrode. The ground electrode includes an upright part and an inclined part. The upright part is a portion vertically provided on a tip end part of the housing to a tip end side. The inclined part is a portion that is bent from the tip of the upright part toward the center electrode side, and is extended toward an oblique tip end side. The inclined part has a ground end face, an opposed face, and a corner curved face. The corner curved face is a face that smoothly connects the ground end face and the opposed face. The corner curved face has a curved shape. The curvature radius R of the corner curved face satisfies 0.3 mm≤R≤0.7 mm. The inclination angle θ of the inclined part with respect to a plug axial direction (Z) satisfies 30°≤θ≤60°.

Description

CROSS-REFERENCE TO RELATED APPLICATION[0001]This application is the U.S. national phase of International Application No. PCT / 2017 / 1012163 filed on Mar. 24, 2017 which designated the U.S. and claims priority to Japanese Patent Application No. 2016-069347 filed on Mar. 30, 2016, the entire contents of each of which are incorporated herein by reference.TECHNICAL FIELD[0002]The present disclosure relates to a spark plug for an internal combustion engine.BACKGROUND ART[0003]As a spark plug used as ignition means in an internal combustion engine, such as an engine of an automobile, there is a spark plug in which a center electrode and a ground electrode are made to axially face each other to form a spark discharge gap. Such a spark plug generates discharge at the spark discharge gap and ignites an air-fuel mixture in a combustion chamber by the discharge.[0004]In the combustion chamber, airflow of the air-fuel mixture, for example, such as swirl flow or tumble flow, is formed and the airf...

Claims

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Application Information

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Patent Type & Authority Patents(United States)
IPC IPC(8): H01T13/22H01T13/32
CPCH01T13/32H01T13/20H01T13/39H01T13/467H01T21/02H01T13/52
Inventor OHNO, RYUICHIAKIYOSHI, RYOHEI
Owner DENSO CORP